Obligate intracellular parasites Intracellular existence protects bug from B-cell defenses Cannot be cultured on inert media Bacteria login to view 5 more bullets Viruses login to view 1 more bullet Protozoa login to view 5 more bullets Fungi login to view 1 more bullet Facultative intracellular parasites Able to live and reproduce either inside or outside of cells Bacteria login to view 10 more bullets Fungi login to view 1 more bullet Helminths login to view 1 more bullet Other obligate parasites Cannot be cultured on inert media Found outside cells Bacteria login to view 1 more bullet Fungus (yeast-like) login to view 1 more bullet